Unit 1-Electricity and Energy Flashcards Preview

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Flashcards in Unit 1-Electricity and Energy Deck (25):
1

What happens to an object when it gains electrons?

It becomes negatively charged

2

What is the definition of current?

The movement of electrons round a circuit

3

What is the equation to find out charge?

Q=It

4

What do you call materials which allow electrons to flow through them?

Conductors

5

What do you call materials which don't allow electrons to flow through them?

Insulators

6

What is the definition of voltage?

The potential difference in charge between two points in an electrical circuit

7

What does Ohm's Law state?

V=IR

8

How do you find the total resistance in a parallel circuit?

1/Rt=1/R1+1/R2+........

9

How does the resistance change in a thermistor relative to the temperature?

Temperature Up Resistance Down (TURD)

10

How does the resistance change in a light dependant resistor relative to the light intensity?

Light Up Resistance Down (LURD)

11

What is the symbol for a resistor?

A image thumb
12

What is the symbol for a capacitor?

A image thumb
13

What is the symbol for a thermistor?

A image thumb
14

What is the symbol for an LDR?

A image thumb
15

What is the symbol for a diode and what way does it face in a circuit?

A image thumb
16

What is the symbol for an L.E.D?

A image thumb
17

What is the symbol for a photovoltaic cell?

A image thumb
18

What is the symbol for a motor?

A image thumb
19

What is the symbol for a loudspeaker?

A image thumb
20

What is the symbol for a NPN transitor and how does it work?

Once the voltage is high enough at the base it allows current to pass through the rest of the circuit

A image thumb
21

What is the symbol for a Multi Oxide Semiconductor Field-effect transitor? (MOSFET)

A image thumb
22

What is the symbol for a relay?

A image thumb
23

What is the symbol for a variable resistor?

A image thumb
24

What equation is used to calculate Power measured in Watts?

P+=E/t

25